scholarly journals Fortuitous underwater acoustic measurements of baleen whale vocalizations by large aperture arrays

1993 ◽  
Vol 94 (3) ◽  
pp. 1822-1822
Author(s):  
G. L. D’Spain ◽  
J. A. Hildebrand ◽  
M. A. McDonald ◽  
W. S. Hodgkiss
Keyword(s):  
Baleen Whale ◽  
Acoustic Measurements ◽  
Underwater Acoustic ◽  
Large Aperture ◽  
Aperture Arrays

System Architecture Of Mmic-Based Large Aperture Arrays For Space Applications

1987 ◽  
Author(s):  
P. R. Herczfeld ◽  
M. Kam ◽  
R. R. Kunath ◽  
K. B. Bhasin ◽  
Nick L. Prade
Keyword(s):  
System Architecture ◽  
Space Applications ◽  
Large Aperture ◽  
Aperture Arrays

scholarly journals Underwater Acoustic Measurements on Polyvinylidene Fluoride Transducers

1978 ◽  
Vol 5 (3) ◽  
pp. 149-157 ◽  
Author(s):  
B. Woodward ◽  
R. C. Chandra
Keyword(s):  
Polyvinylidene Fluoride ◽  
Characteristic Impedance ◽  
Thin Sheet ◽  
Piezoelectric Transducers ◽  
Thin Sheets ◽  
Acoustic Measurements ◽  
Underwater Acoustic ◽  
Source Level ◽  
Operation Parameters

Methods of making piezoelectric transducers from very thin sheets of polyvinylidene fluoride (PVDF) are discussed, together with techniques for calibrating these devices, particularly for underwater operation. Parameters measured include receiving response, source level, beamwidth, characteristic impedance and variation of impedance with frequency. Consideration is also given to the dependence of receiving response on the poling fields and temperatures used in making PVDF transducers. Because of their broadband response thin sheet PVDF transducers have been shown to be ideal for monitoring the true form of acoustic pulses underwater.

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